Field Day presents the largest collection of
FREE
learning games on the web.
OPEN VAULT
Field Day presents the largest collection of
FREE
learning games on the web.
OPEN VAULT
A major challenge where the dye reacts with water instead of the fibre, creating "spent" dye that must be washed away.
The part that provides color (usually azo, anthraquinone, or phthalocyanine groups). Solubilising Group: Often sulfonic acid salts ( SO3Nacap S cap O sub 3 cap N a ) that make the dye water-soluble. The Chemistry of Synthetic Dyes. Reactive Dyes
Common in dyes. The chlorine atom on the dye molecule is displaced by the hydroxyl ( OHcap O cap H ) group of the cellulose or the amino ( NH2cap N cap H sub 2 ) group of protein fibres. Result: A stable carbon-oxygen or carbon-nitrogen bond. 2. Nucleophilic Addition A major challenge where the dye reacts with
The dye attaches to the fibre through a chemical reaction triggered by alkaline conditions (high pH). There are two main types of reaction mechanisms: 1. Nucleophilic Substitution Common in dyes
The "business end" that reacts with the fibre (e.g., vinyl sulfone or cyanuric chloride).
Known for incredibly vivid and brilliant shades.
"Inasmuch as we can capture that wonder… that pure excitement about the complexity and beauty of the world. That will be how much we actually create kids that love science. That love to learn."
―David Gagnon
